Barrel-receiver mounting for firearms



Jan. 5, 1965 H. A. INTO 3,163,952

BARREL-RECEIVER MOUNTING FOR FIREARMS Filed May 24, 1963 INVENTOR. HENRYA 1N 7'0 A TTORNEV United States Patent 3,163,952 BARREL-RECEIVERMOUNTEJG FOR FIREARMS Henry A. Into, Wallingford, Conn, assignor to (HimMathieson Chemical Corporation, a corporation of Virginia Filed May 24,1963, Ser. No. 282,988 Claims. (Cl. 4275) This invention relates to theapparatus and method of removably joining the barrel of a firearm suchas a shotgun or rifle to the receiver.

This invention more particularly relates to the method and means ofremovably joining the barrel of a firearm to the receiver so that thebarrel is readily removable and is securely locked relative to thereceiver against rotational movement. The barrel is removed from thereceiver according to this invention by direct axial pull on the barrel.The alignment of the barrel and the receiver is positively controlled byinterlocking surfaces on the barrel and on the receiver.

According to this invention, a barrel receiving opening is formed in thefront face of a receiver. A step is provided on the front face of thereceiver extending approximately across the diameter of the hole for thebarrel. A flange on the barrel extends approximately halfway around thebarrel and interlocks with the step on the front of the receiver toprevent rotational movement of the barrel relative to the receiver.

A magazine tube or other member is securely mounted in another openingin the front face of the receiver below the barrel, and has a threadedend portion to receive a magazine cap. Mounted on a forward portion ofthe barrel is a magazine tube bracket which is adapted to slide over thetubular magazine as the barrel is mounted in the receiver. The magazinecap is then screwed onto the magazine tube and engages the magazine tubebracket. In assembled condition, the magazine tube is in tension and thebarrel is in compression. The barrel is therefore always being urgedtoward the receiver in interlocked relationship.

This invention provides a simple and economical method of removablyjoining a barrel to the receiver in a shotgun rifle or similar firearm.This invention replaced the more expensive and cumbersome known methodsof joining a barrel to a receiver in a firearm which include providingseparate key means, forming non-cylindrical mating surfaces on thebarrel and the receiver, and screw-threadedly attaching the barrel tothe receiver.

This invention will now be described in detail with reference to theaccompanying drawings in which:

FIGURE 1 is a side view showing a barrel and a receiver removablysecured together according to this invention.

FIGURE 2 is a perspective view showing the details of the steppedreceiver and flanged barrel prior to assembly in the manner according tothis invention.

Refering now to FIGURE 2 of the drawings, a receiver 1 is shown havingan opening 2 in the forward face thereof to accommodate the barrel 3 ofa firearm. As clearly shown in FIGURE 2, the upper portion of thereceiver around opening 2 is cut away as indicated at 4 to provide astep having support surfaces 5 and 6. According to this invention, thestep may be formed in the receiver by cutting away a portion of thereceiver approximately across the the diameter of the hole 2 whichreceives barrel 3. Step 4 may be also formed as the receiver is cast orotherwise fabricated. Barrel 3 is provided with a flange '7 whichextends circumferentially approximately halfway around the barrel.Flange 7 terminates in a pair of support surfaces 8 and 9 which areadapted to mate with surfaces 5 and 6 on the receiver 1 to preventrotation of the barrel relative to the receiver.

Referring now to FIGURE 1, the barrel 1 is provided with a magazine tubebracket 10 rigidly secured to the barrel. The bracket 10 is adapted toslide over and surround a tubular magazine 11 which is rigidly mountedin the receiver and extends generally parallel to the barrel. A forearm12 is slidably or rigidly mounted on the magazine tube. The forearm isslidably mounted in slide action firearms and rigidly mounted in othertypes. A ball detent'13 is mounted in the magazine tube bracket 10 andspring urged outwardly toward the end of the tubular magazine 11. Amagazine cap 14 is screwthreadedly mounted on the forward end of thetubular magazine. Serrations 15 are provided in the magazine cap whichengage ball detent 13 to retain the magazine cap 14 in a tightenedcondition and prevent accidental loosening of the magazine cap.

To assemble the firearm of this invention, the barrel 3 is moved axiallytoward the receiver in the manner indicated in FIGURE 2. The end of thebarrel 3 is received in opening 2 of the receiver and support surfaces6, 8 and 5, 7 interlock to prevent rotation of the barrel relative tothe receiver. During the axial movement of the barrel 3 toward receiver1, magazine tube bracket 10 is slipped over the tubular magazine 11 asseen in FIG- URE 1. Magazine cap 14 is then threaded onto the end oftubular magazine 11 and engages the magazine bracket 10 to prevent axialmovement of bracket 10 and barrel 3 away from the receiver. By thisarrangement, the tubular magazine which is rigidly connected to thereceiver is placed in tension and urged away from the receiver. Thebarrel 3 is placed in compression and urged toward the receiver.Interlocking surfaces 5, 6, 7 and 8 prevent rotation of the barrelrelative to the receiver.

The resulting structure is readily assembled and disassembled andalignment of the barrel and receiver is positive and simple. Thisinvention has been described in detail with reference to a preferredembodiment shown in the drawings. All modifications and design changesare contemplated which are within the spirit and scope of the appendedclaims.

I claim:

1. In a firearm including a receiver and a barrel re movably secured tosaid receiver, said receiver having an opening in a forward face thereofto receive a rear portion of said barrel, flange means partiallysurrounding said rear portion of said barrel, a recess in the forwardface of said receiver providing step means, said step means operativelyengaging the extremities of said flange means to align said barrel withsaid receiver in assembled condition and prevent rotation of said barrelrelative to said receiver.

2. The device of claim 1 in which a tubular magazine is connected tosaid receiver and extends below and substantially parallel to saidbarrel, a magazine tube bracket mounted on said barrel operative tosubstantially surround a portion of said magazine tube in assembledcondition, and a magazine tube cap secured to the free end of saidmagazine tube and engaging said bracket to prevent axial movement ofsaid barrel relative to said receiver.

3. A takedown for a firearm including a receiver, a barrel removablyconnected to said receiver, an opening in a forward face of saidreceiver to accommodate a rear portion of said barrel, a flangepartially surrounding said barrel and terminating in first abuttingsurfaces, a step formed in the forward portion of said receiver havingsecond abutting surfaces operatively engaging said first abuttingsurfaces to insure alignment and prevent rotation of said barrelrelative to said receiver in assembled condition.

4. The device of claim 3 including a tubular member rigidly affixed tosaid receiver and extending substam References Gated by the ExaminerUNITED STATES PATENTS Johnson 4275 Moench 42--49 Simpson 42-75 Horan42-17 Pinckney et al 42-49 0 BENJAMIN A. BORCHELT, Primary Examiner.

1. IN A FIREARM INCLUDING A RECEIVER AND A BARREL REMOVABLY SECURED TOSAID RECEIVER, SAID RECEIVER HAVING AN OPENING IN A FORWARD FACE THEREOFTO RECEIVE A REAR PORTION OF SAID BARREL, FLANGE MEANS PARTIALLYSURROUNDING SAID REAR PORTION OF SAID BARREL, A RECESS IN THE FORWARDFACE OF SAID RECEIVER PROVIDING STEP MEANS, SAID STEP MEANS OPERATIVELYENGAGING THE EXTREMITIES OF SAID FLANGE MEANS TO ALIGN SAID BARREL WITHSAID RECEIVER IN ASSEMBLED CONDITION AND PREVENT ROTATION OF SAID BARRELRELATIVE TO SAID RECEIVER.